Buried deep within Nokia's press release about its financial results, there's a line that pretty much signals the end of one of the most popular and successful mobile operating systems in history. With Nokia retiring its use, Symbian is no more.

Near all of the market share to be exact. What means the Lumia strategy did not worked out, failed miserable 2 times and within that 2 years market share fall down to a rounding error. Consequence will be that strategy is changed and then indeed...

I think its unwise to assume that Nokia will never return

They can return to say 20% OR MORE like they had before that strategy for decades depending on how the new strategy works out.